c++第四次作业

项目三：乘法表

#include<iostream>  using namespace std;  int main()  {      int a,b;      for(a=1;a<=9;a=a+1)      {          for(b=1;b<=a;b=b+1)          {                cout<<b<<"x"<<a<<"="<<a*b<<" ";          }          cout<<endl;      }      return 0;  }  

项目六：星形号

#include<iostream>  using namespace std;  int main()  {        int i,j;      for(j=1;j<=5;j=j+1)          cout<<" ";      cout<<"*"<<endl;      for(i=2;i<=5;i=i+1)      {          for(j=1;j<=6-i;j=j+1)              cout<<" ";          cout<<"*";          for(j=1;j<=2*i-3;j=j+1)              cout<<" ";          cout<<"*"<<endl;    } cout<<"***********"<<endl;  return 0;  }  

项目七：百钱百鸡

<pre class="cpp" name="code">#include <iostream>   using namespace std;    int main()    {        int a,b,c;        for(a=0;a<=20;a++)       for(b=0;b<=33;b++)      for(c=0;c<=300;c++)          if((a+b+c==100)&&(5*a+3*b+c/3==100))        {                cout<<"鸡翁"<<a<<"只，母鸡"<<b<<"只，鸡雏"<<c<<"只"<<endl;      }      return 0;    }